EtherPad is an open-source web service that allows for real-time document collaboration. The Canvas EtherPad service is similar to that of Google Docs, but it does not require an account. However, please note that this app has tested to be slightly buggy, with users sometimes being disconnected from the server without their document saving after moments of inactivity.

Below is a screen of what a typical EtherPad collaboration document would look like after opening it up from Canvas. The document automatically saves after every few edits and is reloaded on all collaboration screens in realtime.